句型1：it+be+adj.(for sb./of sb.)to do

　　it is difficult(for me)to learn russian.(我)學(xué)俄語(yǔ)是件困難的事。

　　it is very kind of you to help me.你幫助我真是太好了。

　　句型2：it +be +adj.+that

　　it is true that he went there.他去了那兒，是真的。

　　句型3：it +be +time +for +n.

　　it +be +time(for sb.)+to do

　　it's time for class.該上課了。

　　it's time(for us)to go to school.(我們)該上學(xué)了。

　　句型4：it+be+時(shí)間/季節(jié)/天氣/距離

　　it's seven now.現(xiàn)在七點(diǎn)了。

　　it's winter now.現(xiàn)在是冬季。

　　it's sunny today.今天陽(yáng)光燦爛。

　　it's twenty miles to london.這里離倫敦有20英里。

　　句型5：it's one's turn(to do)

　　it's your turn to speak.輪到你發(fā)言了。

　　句型6：it +takes/took+sb.+some time +to do

　　it took me two hours to finish the work.我用了兩小時(shí)完成這項(xiàng)工作。

　　句型7：it seems that...

　　it seems that he has been ill for a long time.他好像病了很長(zhǎng)時(shí)間。

　　句型8：it +costs +sb.+some money +to do

　　it cost me 1，000 yuan to buy that bike.買(mǎi)那輛自行車(chē)我用了1000元。

　　句型9：it +be +some time +since...

　　it is three years since he came here.他自來(lái)這兒以來(lái)，已經(jīng)三年了。

　　句型10：it +be +quite +a(an)+adj.+n.

　　it's quite a nice book.它是一本相當(dāng)好的書(shū)。